反应详情

A solution of 5-isopropenyl-2,4-dimethoxy-benzoic acid methyl ester (6.0 g, 25.4 mmol) in MeOH (85 ml) was shaken with 10% Pd/C under an atmosphere of H2 at room temperature for 3 hours. The catalyst was filtered through GF/A paper but a little fine powder passed through. The filtrate was passed through a small pad of silica and evaporated to dryness to yield a colourless solid. The product was purified by flash column chromatography (DCM:Petrol gradient elution) to yield 5-isopropyl-2,4-dimethoxy-benzoic acid methyl ester a colourless solid (5.5 g). 1H NMR (Me-d3-OD) 7.68 (1H, s), 6.64 (1H, s), 3.94 (3H, s), 3.91 (3H, s), 3.84 (3H, s), 3.23 (1H, sept), 1.20 (6H, d). MS: [M+H]+ 239.

1. filtrationThe catalyst was filtered through GF/A paper
2. customevaporated to dryness
3. customto yield a colourless solid
4. customThe product was purified by flash column chromatography (DCM:Petrol gradient elution)